6 healthy Beagle dogs, each infected with 200
Conventional, TDI and contrast echocardiography, invasive PAP measurements before (T0), 7-12 weeks post infection (wpi, T1), and 1-5 days post therapy (dpt, T2).
All dogs had patent infections 7-8 wpi and respiratory signs 6-9 wpi. PAP was mildly but significantly increased at T2. Saline contrast echo was positive in 3/6 dogs at T1 and 4/6 dogs at T2. Pulmonary transit time did not change. Of all numeric echocardiographic parameters, only a non-significant decrease in the E鈥?wave and inversion of E鈥?A鈥?ratio in 3 dogs at T2 could be observed. Two of these had mild PH and negative saline contrast echocardiography.
A. vasorum infection causes only a mild increase in PAP following inoculation and anthelmintic therapy. The absence of important PH may in part be explained by the recruitment of AV shunts in the presence of vascular obstructive disease. TDI echocardiographic parameters may be more sensitive to detect mild changes in RV function than conventional parameters.